粒度可控氧化钇粉体的制备

以硝酸钇为原料溶液，采用氨水-草酸2步沉淀法合成了中心粒径（D₅₀）为1.00~2.00 μm的氧化钇粉体，粉体分散性好，粒度可控.考察了沉淀剂的浓度、物料的浓度、反应温度、加料速度以及pH值等因素对氧化钇粉末中心粒度的影响.采用激光粒度仪、比表面仪、扫描电子显微镜等仪器对实验过程及实验结果进行表征和分析.结果表明，在氨水浓度为1.0 mol/L、草酸质量浓度为10 %、滴加速度为20 mL/min、草酸溶液温度为80 ℃、氨水沉淀后pH值在7~8之间、草酸转化后pH值小于1的条件下，可通过调节硝酸钇的浓度在0.4~0.8 mol/L之间，以制备中心粒径（D₅₀）在1.00~2.00 μm范围内、比表面积在3.2~13.3 m2/g之间的氧化钇粉体. 

Preparation of size controllable yttrium oxide powder

Yttrium oxide powder was prepared by ammonia-oxalic acid two steps method. The cental particle size (D₅₀) was controlled to be 1.00~2.00 μm with good dispersibility. The effects of precipitant concentration, material concentration, reaction temperature, feeding rate and pH on the medium particle size of yttrium oxide powder were studied. Laser particle analyzer, BET instrument and scanning electron microscope were used to analyze the particle size and specific surface area of yttrium oxide powder. The results show that when the concentration of ammonium hydroxide is 1.0 mol/L, the mass concentration of oxalic acid is 10 %, the dropping speed is 20 mL/min, the temperature of oxalic acid solution is 80 ℃, the pH of the solution precipitated by ammonium hydroxide is 7~8 and the pH of the solution precipitated by oxalic acid is below 1, the central particle size (D₅₀) and specificsurface area of the prepared yttrium oxide powder are controlled to be 1.00~2.00 μm and 3.2~13.3 m2/g by adjusting the concentration of yttrium nitrate in the range of 0.4~0.8 mol/L.